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https://issues.apache.org/jira/browse/CALCITE-6586?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17884650#comment-17884650
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Caican Cai commented on CALCITE-6586:
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[~suibianwanwan33] Can you give me some examples? I don't know much about this.
> Some Rules not firing due to RelMdPredicates returning null in VolcanoPlanner
> -----------------------------------------------------------------------------
>
> Key: CALCITE-6586
> URL: https://issues.apache.org/jira/browse/CALCITE-6586
> Project: Calcite
> Issue Type: Improvement
> Reporter: suibianwanwan
> Priority: Major
> Labels: pull-request-available
>
> Because getPredicates(RelSubset r, RelMetadataQuery mq) returns null by
> default, some rules will not work in volcanoPlanner. Such as
> SortRemoveConstantKeysRule, UnionPullUpConstantsRule,
> ExchangeRemoveConstantKeysRule, AggregateJoinTransposeRule,
> ReduceExpressionsRule, etc.
> {code:java}
> public RelOptPredicateList getPredicates(RelSubset r,
> RelMetadataQuery mq) {
> if (!Bug.CALCITE_1048_FIXED) {
> return RelOptPredicateList.EMPTY;
> }
> }{code}
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